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Depends on how you define "capable":

  • Has a device design known to work: 1949
  • Has deliverable weapons: 1949 (test device was in deliverable casing)
  • Has large enough stockpile to be a threat: maybe late 1951 to middle 1952 (hard to estimate as stockpile figures are classified, this is my best guess)

The US itself did not seem to have a large enough stockpile until 1948, around the time of Operation Sandstone.

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Q: When was the USSR nuclear capable?
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